The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
He bought a / pen; a / pen was silver / grey in colour.

Correct option is D

Option (d) contains an error.

• Error Identification: The error lies in the article usage in "pen was silver". After a semicolon, the sentence starts with "pen" without an article. This creates a fragmented sentence that lacks proper subject-verb agreement.

• Correction: It should be "The pen was silver," where "the" correctly specifies the pen that was already introduced in the previous clause.

• Grammatical Rule Involved: When referring to a specific noun that has already been mentioned, we use the definite article "the." In this case, "the pen" refers back to the previously mentioned pen.

• Example:
  Incorrect: "I saw a movie; movie was great."
  Correct: "I saw a movie; the movie was great."